What is the format that the Nook Kids books use?
Is it epub?
There is a Nook for PC reader, as well as a Nook iphone app. Do Nook Kids books function on all of those Nook readers?
If most Nook Kids books are picture and text books, how are different sized screens handled?
Sign up for the SDK. It's free, answer all questions on the sign up page even if they don't apply or you don't know what they mean. Just fill something in.
The ActiveTouch is part of the SDK which hasn't been released to the public yet.
I presume there will be some option to pubit! ActiveTouch books and the real documentation should be in that SDK that should cover topics like the different formats.
Nookkids books, that have the enhanced sounds and the custom read-to-me (pre-recorded like a mp3 and not text to speech) all fall under the ActiveTouch technology which is a part of the SDK.
It's one small feature of the SDK itself. Even though I've signed up, the SDK hasn't been released for the masses. Once you sign up, they will email you when it's released.
The active-touch was probably the one feature that really was completed first and that professional publishing houses have had access to for some time.
As to your other questions, I'm baffled as well.
I would presume there would be a Pubit! option for these ActiveTouch books as well, but also like you, have found extremely little useful information.
On the SDK signup page, there is a link to learn more or something like that where you can download an interesting, but not very detailed, pdf of the SDK program.